import Vue from 'vue'
import Router from 'vue-router'
import Login from './components/Login.vue'
import Home from './components/Home.vue'
import Welcome from './components/Welcome.vue'
import Users from './components/user/Users.vue'
Vue.use(Router)

const router = new Router({
  routes: [
    { path:'/',component:Login},
    { path:'/login',component:Login},
    { 
      path:'/home',
      component:Home,
      redirect:'/welcome',
      children:[{path:'/welcome',component:Welcome},
      {path:'/users',component:Users}]      
    }    
  ]
})
// 挂载路由导航守卫
router.beforeEach((to, from, next)=>{
  // to 将要访问的路径
  // from代表从哪个路径跳转而来
  // next是一个函数，表示放行
  // next()放行  next('/login') 强制跳转

  if (to.path === '/login') return next()
  //获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if(!tokenStr) return next('/login')
  next()
})
export default router